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The chromosomal distribution of satellite DNA in the germ-line and somatic tissues of the gall midge, Heteropeza pygmaea

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Abstract

Somatic DNA from Heteropeza pygmaea separated in CsCl gradients into a main band DNA (ϱ=1.685 g/cm3) and a satellite band (ϱ=1.716 g/cm3) comprising 15% of the total DNA. The satellite melted sharply at 93.0°C in SSC, 10.4°C higher than the main band DNA. Satellite DNA reassociated rapidly, banding in CsCl heavier than native satellite but lighter than denatured satellite. The complementary strands of the satellite formed a single band in alkaline gradients and hence are apparently similar in G+T composition. — Filter hybridization experiments with Xenopus ribosomal RNA showed that the satellite band does not contain ribosomal cistrons. — Complementary RNA (cRNA) transcribed in vitro from isolated satellite bound extensively to satellite DNA but not to main band DNA. — The strain of Heteropeza used here contained about 58 chromosomes in germ-line cells and reproduced only paedogenetically. During early cleavage, the presumptive somatic nuclei eliminate most of their chromosomes (E-chromosomes) and retain only ten (S-chromosomes). In situ hybridizations with satellite-cRNA showed satellite DNA (prepared from predominately somatic tissues) to be localized in the centromeric heterochromatin of S- and E-chromosomes. Silver grain comparisons suggested that the amount of satellite is equivalent in both types of chromosomes. — Lastly we found that both diploid and polyploid cells contain similar amounts of satellite DNA. We interpreted this to mean that during polyploidization, as has been demonstrated during polytenization, satellite DNA does not replicate or replicates only slightly while other DNA fractions increase.

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Kunz, W., Eckhardt, R.A. The chromosomal distribution of satellite DNA in the germ-line and somatic tissues of the gall midge, Heteropeza pygmaea . Chromosoma 47, 1–19 (1974). https://doi.org/10.1007/BF00326268

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